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Actor Zeppo Marx patented a "Cardiac Pulse Rate Monitor" in 1969.
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| Number | Title | Issue Date |
| 6695001 | Gas connection housing and a method of constructing a gas connection housing A housing for receiving a gas line, sized to fit behind the plane of a wall. The housing including a back member and a plurality of side members sealed along a plurality of seams to define a enclosure having an open face generally parallel to the back mem... | 02/24/2004 |
| 3931829 | Valved service outlet A valved serviced outlet for oxygen having a number of improved features including an improved guiding and locking means, an improved door, improved valving means and an improved valve body.... | 01/13/1976 |
